﻿/**
 * Tencent is pleased to support the open source community by making Tars available.
 *
 * Copyright (C) 2016THL A29 Limited, a Tencent company. All rights reserved.
 *
 * Licensed under the BSD 3-Clause License (the "License"); you may not use this file except
 * in compliance with the License. You may obtain a copy of the License at
 *
 * https://opensource.org/licenses/BSD-3-Clause
 *
 * Unless required by applicable law or agreed to in writing, software distributed
 * under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
 * CONDITIONS OF ANY KIND, either express or implied. See the License for the
 * specific language governing permissions and limitations under the License.
 */

#ifndef __TARS_H__
#define __TARS_H__

#include <iostream>
#include <cassert>
#include <vector>
#include <map>
#include <string>
#include <stdexcept>
#include <functional>
#include <stdint.h>
#include <string.h>
#include <limits.h>
#include <stdio.h>

#if defined _WIN32 || defined _WIN64
#pragma comment(lib,"ws2_32.lib")
#else
#include <arpa/inet.h>
#endif

//支持iphone
#ifdef __APPLE__
#include "TarsType.h"
#elif defined ANDROID  // android
#include "TarsType.h"
#else
    #include "tup/TarsType.h"
#endif


#ifndef tars_likely
#if defined(__GNUC__) && __GNUC__ >= 4
#define tars_likely(x)            (__builtin_expect(!!(x),1))
#else
#define tars_likely(x)   (x)
#endif
#endif

#ifndef tars_unlikely
#if defined(__GNUC__) && __GNUC__ >= 4
#define tars_unlikely(x)            (__builtin_expect(!!(x),0))
#else
#define tars_unlikely(x)   (x)
#endif
#endif

//数据头类型
#define TarsHeadeChar  0
#define TarsHeadeShort 1
#define TarsHeadeInt32 2
#define TarsHeadeInt64 3
#define TarsHeadeFloat 4
#define TarsHeadeDouble 5
#define TarsHeadeString1 6
#define TarsHeadeString4 7
#define TarsHeadeMap 8
#define TarsHeadeList 9
#define TarsHeadeStructBegin 10
#define TarsHeadeStructEnd 11
#define TarsHeadeZeroTag 12
#define TarsHeadeSimpleList 13


//////////////////////////////////////////////////////////////////
//// 保留接口版本Tars宏定义
//编码相应的宏

#define TarsReserveBuf(os, len) \
do{ \
    if(tars_likely((os)._buf_len < (len))) \
    { \
        size_t len1 = (len)<<1; \
        if(len1<128) len1=128; \
        (os)._buf = (os)._reserve(os, len1); \
        (os)._buf_len = (len1); \
    } \
}while(0)


#define TarsWriteToHead(os, type, tag) \
do { \
    if (tars_likely((tag) < 15)) \
    { \
        TarsWriteUInt8TTypeBuf( os, (type) + ((tag)<<4) , (os)._len); \
    } \
    else \
    { \
        TarsWriteUInt8TTypeBuf( os, (type) + (240) , (os)._len); \
        TarsWriteUInt8TTypeBuf( os, (tag),  (os)._len);\
    } \
} while(0)

#define TarsWriteCharTypeBuf(os, val, osLen) \
do { \
    TarsReserveBuf(os, (osLen)+sizeof(Char)); \
    (*(Char *)((os)._buf + (osLen))) = (val); \
    (osLen) += sizeof(Char); \
} while(0)

#define TarsWriteInt32TypeBuf(os, val, osLen) \
do { \
    TarsReserveBuf(os, (osLen)+sizeof(Int32)); \
    (*(Int32 *)((os)._buf + (osLen))) = (val); \
    (osLen) += sizeof(Int32); \
} while(0)

#define TarsWriteInt64TypeBuf(os, val, osLen) \
do { \
    TarsReserveBuf(os, (osLen)+sizeof(Int64)); \
    (*(Int64 *)((os)._buf + (osLen))) = (val); \
    (osLen) += sizeof(Int64); \
} while(0)

#define TarsWriteFloatTypeBuf(os, val, osLen) \
do { \
    TarsReserveBuf(os, (osLen)+sizeof(Float)); \
    (*(Float *)((os)._buf + (osLen))) = (val); \
    (osLen) += sizeof(Float); \
} while(0)

#define TarsWriteDoubleTypeBuf(os, val, osLen) \
do { \
    TarsReserveBuf(os, (osLen)+sizeof(Double)); \
    (*(Double *)((os)._buf + (osLen))) = (val); \
    (osLen) += sizeof(Double); \
} while(0)

#define TarsWriteUInt32TTypeBuf(os, val, osLen) \
do { \
    TarsReserveBuf(os, (osLen)+sizeof(uint32_t)); \
    (*(uint32_t *)((os)._buf + (osLen))) = (val); \
    (osLen) += sizeof(uint32_t); \
} while(0)

#define TarsWriteUInt8TTypeBuf(os, val, osLen) \
do { \
    TarsReserveBuf(os, (osLen)+sizeof(uint8_t)); \
    (*(uint8_t *)((os)._buf + (osLen))) = (val); \
    (osLen) += sizeof(uint8_t); \
} while(0)

#define TarsWriteUIntTypeBuf(os, val, osLen) \
do { \
    TarsReserveBuf(os, (osLen)+sizeof(unsigned int)); \
    (*(unsigned int *)((os)._buf + (osLen))) = (val); \
    (osLen) += sizeof(unsigned int); \
} while(0)

#define TarsWriteShortTypeBuf(os, val, osLen) \
do { \
    TarsReserveBuf(os, (osLen)+sizeof(Short)); \
    (*(Short *)((os)._buf + (osLen))) = (val); \
    (osLen) += sizeof(Short); \
} while(0)

#define TarsWriteTypeBuf(os, buf, len) \
do { \
    TarsReserveBuf(os, (os)._len + (len)); \
    memcpy((os)._buf + (os)._len, (const void *)(buf), (len)); \
    (os)._len += (len); \
} while(0)


//解码相应的宏
#define TarsPeekTypeBuf(is, buf, offset, type) \
do { \
    if(tars_unlikely((is)._cur+(offset)+sizeof(type)>(is)._buf_len) )\
    { \
        char s[64]; \
        snprintf(s, sizeof(s), "buffer overflow when peekBuf, over %u.", (uint32_t)((is)._buf_len)); \
        throw TarsDecodeException(s); \
    } \
    (buf) = (*((type *)((is)._buf+(is)._cur+(offset)))); \
} while(0)

#define TarsPeekTypeBufNoTag(is, offset, type) \
do { \
    if(tars_unlikely((is)._cur+(offset)+sizeof(type)>(is)._buf_len) )\
    { \
        char s[64]; \
        snprintf(s, sizeof(s), "buffer overflow when peekBuf, over %u.", (uint32_t)((is)._buf_len)); \
        throw TarsDecodeException(s); \
    } \
} while(0)

#define TarsReadCharTypeBuf(is, buf) \
do { \
    TarsPeekTypeBuf(is, buf, 0, Char); \
    (is)._cur += sizeof(Char); \
} while(0)

#define TarsReadShortTypeBuf(is, buf) \
do { \
    TarsPeekTypeBuf(is, buf, 0, Short); \
    (is)._cur += sizeof(Short); \
} while(0)

#define TarsReadInt32TypeBuf(is, buf) \
do { \
    TarsPeekTypeBuf(is, buf, 0, Int32); \
    (is)._cur += sizeof(Int32); \
} while(0)

#define TarsReadInt64TypeBuf(is, buf) \
do { \
    TarsPeekTypeBuf(is, buf, 0, Int64); \
    (is)._cur += sizeof(Int64); \
} while(0)

#define TarsReadFloatTypeBuf(is, buf) \
do { \
    TarsPeekTypeBuf(is, buf, 0, Float); \
    (is)._cur += sizeof(Float); \
} while(0)

#define TarsReadDoubleTypeBuf(is, buf) \
do { \
    TarsPeekTypeBuf(is, buf, 0, Double); \
    (is)._cur += sizeof(Double); \
} while(0)

#define TarsReadTypeBuf(is, buf, type) \
do { \
    TarsPeekTypeBuf(is, buf, 0, type); \
    (is)._cur += sizeof(type); \
} while(0)

#define TarsReadHeadSkip(is, len) \
do {\
    (is)._cur += (len); \
} while(0)

#define TarsPeekFromHead(is, type, tag, n) \
do { \
    (n) = 1; \
    uint8_t typeTag, tmpTag; \
    TarsPeekTypeBuf(is, typeTag, 0, uint8_t); \
    tmpTag = typeTag >> 4; \
    (type) = (typeTag & 0x0F); \
    if(tars_unlikely(tmpTag == 15)) \
    { \
        TarsPeekTypeBuf(is, tag, 1, uint8_t); \
        (n) += 1; \
    } \
    else \
    { \
        (tag) = tmpTag; \
    } \
} while(0)

#define readFromHead(is, type ,tag) \
do { \
    size_t n = 0; \
    TarsPeekFromHead(is, type, tag, n); \
    TarsReadHeadSkip(is, n); \
} while(0)

#define TarsPeekFromHeadNoTag(is, type, n) \
do { \
    (n) = 1; \
    uint8_t typeTag, tmpTag; \
    TarsPeekTypeBuf(is, typeTag, 0, uint8_t); \
    tmpTag = typeTag >> 4; \
    (type) = (typeTag & 0x0F); \
    if(tars_unlikely(tmpTag == 15)) \
    { \
        TarsPeekTypeBufNoTag(is, 1, uint8_t); \
        (n) += 1; \
    } \
} while(0)

#define readFromHeadNoTag(is, type) \
do { \
    size_t n = 0; \
    TarsPeekFromHeadNoTag(is, type, n); \
    TarsReadHeadSkip(is, n); \
} while(0)

#define TarsPeekBuf(is ,buf, len, offset) \
do {\
    if (tars_unlikely((is)._cur + (offset) + (len) > (is)._buf_len)) \
    { \
        char s[64]; \
        snprintf(s, sizeof(s), "buffer overflow when peekBuf, over %u.", (uint32_t)((is)._buf_len)); \
        throw TarsDecodeException(s); \
    } \
    ::memcpy(buf, (is)._buf + (is)._cur + (offset), (len)); \
} while(0)

#define TarsReadBuf(is, buf, len) \
do { \
    TarsPeekBuf(is, buf, len, 0); \
    (is)._cur += (len); \
} while(0)

#define TarsReadStringBuf(is, str, len) \
do{\
    if (tars_unlikely((is)._cur + (len) > (is)._buf_len)) \
    { \
        char s[64]; \
        snprintf(s, sizeof(s), "buffer overflow when peekBuf, over %u.", (uint32_t)((is)._buf_len)); \
        throw TarsDecodeException(s); \
    } \
    str.assign((is)._buf + (is)._cur, (is)._buf + (is)._cur + (len)); \
    (is)._cur += len; \
} while (0)

#define TarsSkipToTag(flag, tag, retHeadType, retHeadTag) \
do { \
    try \
    { \
        uint8_t nextHeadType, nextHeadTag; \
        while (!ReaderT::hasEnd()) \
        { \
            size_t len = 0; \
            TarsPeekFromHead(*this, nextHeadType, nextHeadTag, len); \
            if (tars_unlikely(nextHeadType == TarsHeadeStructEnd || tag < nextHeadTag)) \
            { \
                break; \
            } \
            if (tag == nextHeadTag) \
            { \
                (retHeadType) = nextHeadType; \
                (retHeadTag) = nextHeadTag; \
                TarsReadHeadSkip(*this, len); \
                (flag) = true; \
                break; \
            } \
            TarsReadHeadSkip(*this, len); \
            skipField(nextHeadType); \
        } \
    } \
    catch (TarsDecodeException& e) \
    { \
    } \
} while(0)

namespace tars
{
//////////////////////////////////////////////////////////////////
struct TarsStructBase
{
protected:
	TarsStructBase() {}

	~TarsStructBase() {}
};

struct TarsProtoException : public std::runtime_error
{
	TarsProtoException(const std::string& s) : std::runtime_error(s) {}
};

struct TarsEncodeException : public TarsProtoException
{
	TarsEncodeException(const std::string& s) : TarsProtoException(s) {}
};

struct TarsDecodeException : public TarsProtoException
{
	TarsDecodeException(const std::string& s) : TarsProtoException(s) {}
};

struct TarsDecodeMismatch : public TarsDecodeException
{
	TarsDecodeMismatch(const std::string & s) : TarsDecodeException(s) {}
};

struct TarsDecodeRequireNotExist : public TarsDecodeException
{
	TarsDecodeRequireNotExist(const std::string & s) : TarsDecodeException(s) {}
};

struct TarsDecodeInvalidValue : public TarsDecodeException
{
	TarsDecodeInvalidValue(const std::string & s) : TarsDecodeException(s) {}
};

struct TarsNotEnoughBuff : public TarsProtoException
{
	TarsNotEnoughBuff(const std::string & s) : TarsProtoException(s) {}
};

//////////////////////////////////////////////////////////////////
namespace
{
/// 数据头信息的封装，包括类型和tag
class DataHead
{
	uint8_t _type;
	uint8_t _tag;
public:
	enum
	{
		eChar = 0,
		eShort = 1,
		eInt32 = 2,
		eInt64 = 3,
		eFloat = 4,
		eDouble = 5,
		eString1 = 6,
		eString4 = 7,
		eMap = 8,
		eList = 9,
		eStructBegin = 10,
		eStructEnd = 11,
		eZeroTag = 12,
		eSimpleList = 13,
	};

#pragma pack(1)
	struct helper
	{
		uint8_t     type : 4;
		uint8_t     tag  : 4;
	};
#pragma pack()
public:
	DataHead() : _type(0), _tag(0) {}
	DataHead(uint8_t type, uint8_t tag) : _type(type), _tag(tag) {}

	uint8_t getTag() const      { return _tag;}
	void setTag(uint8_t t)      { _tag = t;}
	uint8_t getType() const     { return _type;}
	void setType(uint8_t t)     { _type = t;}

	/// 读取数据头信息
	template<typename InputStreamT>
	void readFrom(InputStreamT& is)
	{
		size_t n = peekFrom(is);
		is.skip(n);
	}

	/// 读取头信息，但不前移流的偏移量
	template<typename InputStreamT>
	size_t peekFrom(InputStreamT& is)
	{
		helper h;
		size_t n = sizeof(h);
		is.peekBuf(&h, sizeof(h));
		_type = h.type;
		if (h.tag == 15)
		{
			is.peekBuf(&_tag, sizeof(_tag), sizeof(h));
			n += sizeof(_tag);
		}
		else
		{
			_tag = h.tag;
		}
		return n;
	}

	/// 写入数据头信息
	template<typename OutputStreamT>
	void writeTo(OutputStreamT& os)
	{
		/*
		helper h;
		h.type = _type;
		if(_tag < 15){
			h.tag = _tag;
			os.writeBuf(&h, sizeof(h));
		}else{
			h.tag = 15;
			os.writeBuf(&h, sizeof(h));
			os.writeBuf(&_tag, sizeof(_tag));
		}
		*/
		writeTo(os, _type, _tag);
	}

	/// 写入数据头信息
	template<typename OutputStreamT>
	static void writeTo(OutputStreamT& os, uint8_t type, uint8_t tag)
	{
		helper h;
		h.type = type;
		if (tag < 15)
		{
			h.tag = tag;
			os.writeBuf((const char *)&h, sizeof(h));
		}
		else
		{
			h.tag = 15;
			os.writeBuf((const char *)&h, sizeof(h));
			os.writeBuf((const char *)&tag, sizeof(tag));
		}
	}
};
}


//////////////////////////////////////////////////////////////////
/// 缓冲区读取器封装
class BufferReader
{
private:
	BufferReader(const BufferReader&);

	BufferReader& operator=(const BufferReader&);

public:
	const char *        _buf;        ///< 缓冲区
	size_t              _buf_len;    ///< 缓冲区长度
	size_t              _cur;        ///< 当前位置

public:

	BufferReader() : _buf(NULL),_buf_len(0),_cur(0) {}

	void reset() { _cur = 0;}

	/// 读取缓存
	void readBuf(void * buf, size_t len)
	{
		if(len <= _buf_len && (_cur + len) <= _buf_len)
		{
			peekBuf(buf, len);
			_cur += len;
		}
		else
		{
			char s[64];
			snprintf(s, sizeof(s), "buffer overflow when skip, over %u.", (uint32_t)_buf_len);
			throw TarsDecodeException(s);
		}
	}

	/// 读取缓存，但不改变偏移量
	void peekBuf(void * buf, size_t len, size_t offset = 0)
	{
		if (_cur + offset + len > _buf_len)
		{
			char s[64];
			snprintf(s, sizeof(s), "buffer overflow when peekBuf, over %u.", (uint32_t)_buf_len);
			throw TarsDecodeException(s);
		}
		::memcpy(buf, _buf + _cur + offset, len);
	}

	/// 读取缓存 for vector<char>
	template <typename Alloc>
	void readBuf(std::vector<Char, Alloc>& v, size_t len)
	{
		if(len <= _buf_len && (_cur + len) <= _buf_len)
		{
			peekBuf(v, len);
			_cur += len;
		}
		else
		{
			char s[64];
			snprintf(s, sizeof(s), "buffer overflow when skip, over %u.", (uint32_t)_buf_len);
			throw TarsDecodeException(s);
		}
	}

	/// 读取缓存，但不改变偏移量 for vector<char>
	template <typename Alloc>
	void peekBuf(std::vector<Char, Alloc>& v, size_t len, size_t offset = 0)
	{
		if (_cur + offset + len > _buf_len)
		{
			char s[64];
			snprintf(s, sizeof(s), "buffer overflow when peekBuf, over %u.", (uint32_t)_buf_len);
			throw TarsDecodeException(s);
		}

		const char* begin = _buf + _cur + offset;
		v.assign(begin, begin + len);
	}

	/// 跳过len个字节
	void skip(size_t len)
	{
		if(len <= _buf_len && (_cur + len) <= _buf_len)
		{
			_cur += len;
		}
		else
		{
			char s[64];
			snprintf(s, sizeof(s), "buffer overflow when skip, over %u.", (uint32_t)_buf_len);
			throw TarsDecodeException(s);
		}
	}

	/// 设置缓存
	void setBuffer(const char * buf, size_t len)
	{
		_buf = buf;
		_buf_len = len;
		_cur = 0;
	}

	/// 设置缓存
	template<typename Alloc>
	void setBuffer(const std::vector<char,Alloc> &buf)
	{
		_buf = buf.data();
		_buf_len = buf.size();
		_cur = 0;
	}

	/**
	 * 判断是否已经到BUF的末尾
	 */
	bool hasEnd()
	{
		if(_cur > _buf_len)
		{
			char s[64];
			snprintf(s, sizeof(s), "buffer overflow when skip, over %u.", (uint32_t)_buf_len);
			throw TarsDecodeException(s);
		}
		return _cur >= _buf_len;
	}
	size_t tellp() const
	{
		return _cur;
	}
	const char* base() const
	{
		return _buf;
	}
	size_t size() const
	{
		return _buf_len;
	}
};

//当tars文件中含有指针型类型的数据用MapBufferReader读取
//在读数据时利用MapBufferReader提前分配的内存 减少运行过程中频繁内存分配
//结构中定义byte指针类型，指针用*来定义，如下：
//byte *m;
//指针类型使用时需要MapBufferReader提前设定预分配内存块setMapBuffer()，
//指针需要内存时通过偏移指向预分配内存块，减少解码过程中的内存申请
class MapBufferReader : public BufferReader
{

public:
	MapBufferReader() : _buf_m(NULL),_buf_len_m(0),_cur_m(0) {}

	void reset() { _cur_m = 0; BufferReader::reset();}

	char* cur()
	{
		if (tars_unlikely(_buf_m == NULL))
		{
			char s[64];
			snprintf(s, sizeof(s), "MapBufferReader's buff not set,_buf = null");
			throw TarsDecodeException(s);
		}
		return _buf_m+_cur_m;
	}

	size_t left(){return _buf_len_m-_cur_m;}

	/// 跳过len个字节
	void mapBufferSkip(size_t len)
	{
		if (tars_unlikely(_cur_m + len > _buf_len_m))
		{
			char s[64];
			snprintf(s, sizeof(s), "MapBufferReader's buffer overflow when peekBuf, over %u.", (uint32_t)_buf_len_m);
			throw TarsDecodeException(s);
		}
		_cur_m += len;
	}

	/// 设置缓存
	void setMapBuffer(char * buf, size_t len)
	{
		_buf_m = buf;
		_buf_len_m = len;
		_cur_m = 0;
	}

	/// 设置缓存
	template<typename Alloc>
	void setMapBuffer(std::vector<char,Alloc> &buf)
	{
		_buf_m = buf.data();
		_buf_len_m = buf.size();
		_cur_m = 0;
	}
public:
	char *              _buf_m;        ///< 缓冲区
	size_t              _buf_len_m;    ///< 缓冲区长度
	size_t              _cur_m;        ///< 当前位置
};

//////////////////////////////////////////////////////////////////
/// 缓冲区写入器封装
class BufferWriter
{
public:
	char *  _buf;
	size_t  _len;
	size_t  _buf_len;
	std::function<char*(BufferWriter &, size_t)>  _reserve = BufferWriter::reserve;    //扩展空间

	static char* reserve(BufferWriter &os, size_t len)
	{
		char * p = new char[(len)];
		memcpy(p, (os)._buf, (os)._len);
		delete[] (os)._buf;
		return p;
	}

private:
	BufferWriter(const BufferWriter & bw);
	BufferWriter& operator=(const BufferWriter& buf);

public:
	BufferWriter()
		: _buf(NULL)
		, _len(0)
		, _buf_len(0)
	{}
	~BufferWriter()
	{
		delete[] _buf;
	}

	void reset() { _len = 0;}
	void writeBuf(const char * buf, size_t len)
	{
		TarsReserveBuf(*this, _len + len);
		memcpy(_buf + _len, buf, len);
		_len += len;
	}
	std::vector<char> getByteBuffer() const      { return std::vector<char>(_buf, _buf + _len);}
	const char * getBuffer() const               { return _buf;}//{ return &_buf[0]; }
	size_t getLength() const                     { return _len;} //{ return _buf.size(); }
	void swap(std::vector<char>& v)              { v.assign(_buf, _buf + _len); }
	void swap(std::string& v)                    { v.assign(_buf, _len); }
	void swap(BufferWriter& buf)
	{
		std::swap(_buf, buf._buf);
		std::swap(_buf_len, buf._buf_len);
		std::swap(_len, buf._len);
	}
};

///////////////////////////////////////////////////////////////////////////////////////////////////
/// 实际buffer是std::string
/// 可以swap, 把buffer交换出来, 避免一次内存copy
class BufferWriterString
{
protected:
	mutable std::string _buffer;
	char *  _buf;
	size_t  _len;
	size_t  _buf_len;
	std::function<char*(BufferWriterString &, size_t)>  _reserve;

private:
	//不让copy 复制
	BufferWriterString(const BufferWriterString&);
	BufferWriterString& operator=(const BufferWriterString& buf);

public:
	BufferWriterString()
		: _buf(NULL)
		, _len(0)
		, _buf_len(0)
	{
#ifndef GEN_PYTHON_MASK
		//内存分配器
		_reserve = [](BufferWriterString &os, size_t len) {
			os._buffer.resize(len);
			return (char*)os._buffer.data();
		} ;
#endif
	}

	~BufferWriterString()
	{
	}

	void reset() { _len = 0;}

	void writeBuf(const char * buf, size_t len)
	{
		TarsReserveBuf(*this, _len + len);
		memcpy(_buf + _len, buf, len);
		_len += len;
	}

	const std::string &getByteBuffer()  const { _buffer.resize(_len); return _buffer;}
	std::string &getByteBuffer() { _buffer.resize(_len); return _buffer;}
	const char * getBuffer() const      { return _buf;}
	size_t getLength() const            { return _len;}
	void swap(std::string& v)
	{
		_buffer.resize(_len);
		v.swap(_buffer);
		_buf = NULL;
		_buf_len = 0;
		_len = 0;
	}
	void swap(std::vector<char>& v)
	{
		_buffer.resize(_len);
		v.assign(_buffer.c_str(), _buffer.c_str() + _buffer.size());
		_buf = NULL;
		_buf_len = 0;
		_len = 0;
	}
	void swap(BufferWriterString& buf)
	{
		buf._buffer.swap(_buffer);
		std::swap(_buf, buf._buf);
		std::swap(_buf_len, buf._buf_len);
		std::swap(_len, buf._len);
	}
};

/// 实际buffer是std::vector<char>
/// 可以swap, 把buffer交换出来, 避免一次内存copy
class BufferWriterVector
{
protected:
	mutable std::vector<char> _buffer;
	char *  _buf;
	size_t  _len;
	size_t  _buf_len;
	std::function<char*(BufferWriterVector &, size_t)>  _reserve;

private:
	//不让copy 复制
	BufferWriterVector(const BufferWriterVector&);
	BufferWriterVector& operator=(const BufferWriterVector& buf);

public:
	BufferWriterVector()
		: _buf(NULL)
		, _len(0)
		, _buf_len(0)
	{
#ifndef GEN_PYTHON_MASK
		//内存分配器
		_reserve = [](BufferWriterVector &os, size_t len) {
			os._buffer.resize(len);
			return os._buffer.data();
		} ;
#endif
	}

	~BufferWriterVector()
	{
	}

	void reset() { _len = 0;}

	void writeBuf(const char * buf, size_t len)
	{
		TarsReserveBuf(*this, _len + len);
		memcpy(_buf + _len, buf, len);
		_len += len;
	}

	const std::vector<char> &getByteBuffer() const { _buffer.resize(_len); return _buffer;}
	std::vector<char> &getByteBuffer()  { _buffer.resize(_len); return _buffer;}
	const char * getBuffer() const      { return _buf;}
	size_t getLength() const            { return _len;}
	void swap(std::string& v)
	{
		_buffer.resize(_len);
		v.assign(_buffer.data(), _buffer.size());
		_buf = NULL;
		_buf_len = 0;
		_len = 0;
	}
	void swap(std::vector<char>& v)
	{
		_buffer.resize(_len);
		v.swap(_buffer);
		_buf = NULL;
		_buf_len = 0;
		_len = 0;
	}
	void swap(BufferWriterVector& buf)
	{
		buf._buffer.swap(_buffer);
		std::swap(_buf, buf._buf);
		std::swap(_buf_len, buf._buf_len);
		std::swap(_len, buf._len);
	}
};

//////////////////////////////////////////////////////////////////
template<typename ReaderT = BufferReader>
class TarsInputStream : public ReaderT
{
public:

	/// 跳到指定标签的元素前
	bool skipToTag(uint8_t tag)
	{
		try
		{
			uint8_t headType = 0, headTag = 0;
			while (!ReaderT::hasEnd())
			{
				size_t len = 0;
				TarsPeekFromHead(*this, headType, headTag, len);
				if (tag <= headTag || headType == TarsHeadeStructEnd)
					return headType == TarsHeadeStructEnd?false:(tag == headTag);
				TarsReadHeadSkip(*this, len);
				skipField(headType);
			}
		}
		catch (TarsDecodeException& e)
		{
		}
		return false;
	}

	/// 跳到当前结构的结束
	void skipToStructEnd()
	{
		uint8_t headType = 0;
		do
		{
			readFromHeadNoTag(*this, headType);
			skipField(headType);
		}while (headType != TarsHeadeStructEnd);
	}

	/// 跳过一个字段
	void skipField()
	{
		uint8_t headType = 0;
		readFromHeadNoTag(*this, headType);
		skipField(headType);
	}

	/// 跳过一个字段，不包含头信息
	void skipField(uint8_t type)
	{
		switch (type)
		{
			case TarsHeadeChar:
				TarsReadHeadSkip(*this, sizeof(Char));
				break;
			case TarsHeadeShort:
				TarsReadHeadSkip(*this, sizeof(Short));
				break;
			case TarsHeadeInt32:
				TarsReadHeadSkip(*this, sizeof(Int32));
				break;
			case TarsHeadeInt64:
				TarsReadHeadSkip(*this, sizeof(Int64));
				break;
			case TarsHeadeFloat:
				TarsReadHeadSkip(*this, sizeof(Float));
				break;
			case TarsHeadeDouble:
				TarsReadHeadSkip(*this, sizeof(Double));
				break;
			case TarsHeadeString1:
			{
				size_t len = 0;
				TarsReadTypeBuf(*this, len, uint8_t);
				TarsReadHeadSkip(*this, len);
			}
				break;
			case TarsHeadeString4:
			{
				size_t len = 0;
				TarsReadTypeBuf(*this, len, uint32_t);
				len = ntohl((uint32_t)len);
				TarsReadHeadSkip(*this, len);
			}
				break;
			case TarsHeadeMap:
			{
				UInt32 size = 0;
				read(size, 0);
				for (UInt32 i = 0; i < size * 2; ++i)
					skipField();
			}
				break;
			case TarsHeadeList:
			{
				UInt32 size = 0;
				read(size, 0);
				for (UInt32 i = 0; i < size; ++i)
					skipField();
			}
				break;
			case TarsHeadeSimpleList:
			{
				uint8_t headType = 0, headTag = 0;
				readFromHead(*this, headType, headTag);
				if (tars_unlikely(headType != TarsHeadeChar))
				{
					char s[64];
					snprintf(s, sizeof(s), "skipField with invalid type, type value: %d, %d, %d.", type, headType, headTag);
					throw TarsDecodeMismatch(s);
				}
				UInt32 size = 0;
				read(size, 0);
				TarsReadHeadSkip(*this, size);
			}
				break;
			case TarsHeadeStructBegin:
				skipToStructEnd();
				break;
			case TarsHeadeStructEnd:
			case TarsHeadeZeroTag:
				break;
			default:
			{
				char s[64];
				snprintf(s, sizeof(s), "skipField with invalid type, type value:%d.", type);
				throw TarsDecodeMismatch(s);
			}
		}
	}

	/// 读取一个指定类型的数据（基本类型）
	template<typename T>
	inline T readByType()
	{
		T n;
		this->readBuf(&n, sizeof(n));
		return n;
	}
	void readUnknown(std::string & sUnkown, uint8_t tag)
	{

		size_t start = ReaderT::tellp();
		size_t last  = start;
		try
		{
			uint8_t lasttag = tag;
			DataHead h;
			while (!ReaderT::hasEnd())
			{
				size_t len = h.peekFrom(*this);
				if ( h.getTag() <=lasttag)
				{
					break;
				}
				lasttag = h.getTag();
				this->skip(len);
				skipField(h.getType());
				last = ReaderT::tellp(); //记录下最后一次正常到达的位置
			}
		}
		catch (...) //
		{
			throw;
		}
		std::string s(ReaderT::base() +start, last - start);
		sUnkown = s;
		return ;

	}
	friend class XmlProxyCallback;

	void read(Bool& b, uint8_t tag, bool isRequire = true)
	{
		Char c = b;
		read(c, tag, isRequire);
		b = c ? true : false;
	}

	void read(Char& c, uint8_t tag, bool isRequire = true)
	{
		uint8_t headType = 0, headTag = 0;
		bool skipFlag = false;
		TarsSkipToTag(skipFlag, tag, headType, headTag);
		if (tars_likely(skipFlag))
		{
			switch (headType)
			{
				case TarsHeadeZeroTag:
					c = 0;
					break;
				case TarsHeadeChar:
					TarsReadTypeBuf(*this, c, Char);
					break;
				default:
				{
					char s[64];
					snprintf(s, sizeof(s), "read 'Char' type mismatch, tag: %d, get type: %d.", tag, headType);
					throw TarsDecodeMismatch(s);
				}

			}
		}
		else if (tars_unlikely(isRequire))
		{
			char s[64];
			snprintf(s, sizeof(s), "require field not exist, tag: %d, headTag: %d.", tag, headTag);
			throw TarsDecodeRequireNotExist(s);
		}
	}

	void read(UInt8& n, uint8_t tag, bool isRequire = true)
	{
		Short i = (Short)n;
		read(i,tag,isRequire);
		n = (UInt8)i;
	}

	void read(Short& n, uint8_t tag, bool isRequire = true)
	{
		uint8_t headType = 0, headTag = 0;
		bool skipFlag = false;
		TarsSkipToTag(skipFlag, tag, headType, headTag);
		if (tars_likely(skipFlag))
		{
			switch (headType)
			{
				case TarsHeadeZeroTag:
					n = 0;
					break;
				case TarsHeadeChar:
					TarsReadTypeBuf(*this, n, Char);
					break;
				case TarsHeadeShort:
					TarsReadTypeBuf(*this, n, Short);
					n = ntohs(n);
					break;
				default:
				{
					char s[64];
					snprintf(s, sizeof(s), "read 'Short' type mismatch, tag: %d, get type: %d.", tag, headType);
					throw TarsDecodeMismatch(s);
				}
			}
		}
		else if (tars_unlikely(isRequire))
		{
			char s[64];
			snprintf(s, sizeof(s), "require field not exist, tag: %d, headTag: %d", tag, headTag);
			throw TarsDecodeRequireNotExist(s);
		}
	}

	void read(UInt16& n, uint8_t tag, bool isRequire = true)
	{
		Int32 i = (Int32)n;
		read(i,tag,isRequire);
		n = (UInt16)i;
	}

	void read(Int32& n, uint8_t tag, bool isRequire = true)
	{
		uint8_t headType = 1, headTag = 1;
		bool skipFlag = false;
		TarsSkipToTag(skipFlag, tag, headType, headTag);
		if (tars_likely(skipFlag))
		{
			switch (headType)
			{
				case TarsHeadeZeroTag:
					n = 0;
					break;
				case TarsHeadeChar:
					TarsReadTypeBuf(*this, n, Char);
					break;
				case TarsHeadeShort:
					TarsReadTypeBuf(*this, n, Short);
					n = (Short)ntohs(n);
					break;
				case TarsHeadeInt32:
					TarsReadTypeBuf(*this, n, Int32);
					n = ntohl(n);
					break;
				default:
				{
					char s[64];
					snprintf(s, sizeof(s), "read 'Int32' type mismatch, tag: %d, get type: %d.", tag, headType);
					throw TarsDecodeMismatch(s);
				}
			}
		}
		else if (tars_unlikely(isRequire))
		{
			char s[64];
			snprintf(s, sizeof(s), "require field not exist, tag: %d headType: %d, headTag: %d", tag, headType, headTag);
			throw TarsDecodeRequireNotExist(s);
		}
	}

	void read(UInt32& n, uint8_t tag, bool isRequire = true)
	{
		Int64 i = (Int64)n;
		read(i,tag,isRequire);
		n = (UInt32)i;
	}

	void read(Int64& n, uint8_t tag, bool isRequire = true)
	{
		uint8_t headType = 0, headTag = 0;
		bool skipFlag = false;
		TarsSkipToTag(skipFlag, tag, headType, headTag);
		if (tars_likely(skipFlag))
		{
			switch(headType)
			{
				case TarsHeadeZeroTag:
					n = 0;
					break;
				case TarsHeadeChar:
					TarsReadTypeBuf(*this, n, Char);
					break;
				case TarsHeadeShort:
					TarsReadTypeBuf(*this, n, Short);
					n = (Short) ntohs(n);
					break;
				case TarsHeadeInt32:
					TarsReadTypeBuf(*this, n, Int32);
					n = (Int32) ntohl(n);
					break;
				case TarsHeadeInt64:
					TarsReadTypeBuf(*this, n, Int64);
					n = tars_ntohll(n);
					break;
				default:
				{
					char s[64];
					snprintf(s, sizeof(s), "read 'Int64' type mismatch, tag: %d, get type: %d.", tag, headType);
					throw TarsDecodeMismatch(s);
				}

			}
		}
		else if (tars_unlikely(isRequire))
		{
			char s[64];
			snprintf(s, sizeof(s), "require field not exist, tag: %d, headTag: %d", tag, headTag);
			throw TarsDecodeRequireNotExist(s);
		}
	}

	void read(Float& n, uint8_t tag, bool isRequire = true)
	{
		uint8_t headType = 0, headTag = 0;
		bool skipFlag = false;
		TarsSkipToTag(skipFlag, tag, headType, headTag);
		if (tars_likely(skipFlag))
		{
			switch(headType)
			{
				case TarsHeadeZeroTag:
					n = 0;
					break;
				case TarsHeadeFloat:
					TarsReadTypeBuf(*this, n, float);
					n = tars_ntohf(n);
					break;
				default:
				{
					char s[64];
					snprintf(s, sizeof(s), "read 'Float' type mismatch, tag: %d, get type: %d.", tag, headType);
					throw TarsDecodeMismatch(s);
				}
			}
		}
		else if (tars_unlikely(isRequire))
		{
			char s[64];
			snprintf(s, sizeof(s), "require field not exist, tag: %d, headTag: %d", tag, headTag);
			throw TarsDecodeRequireNotExist(s);
		}
	}

	void read(Double& n, uint8_t tag, bool isRequire = true)
	{
		uint8_t headType = 0, headTag = 0;
		bool skipFlag = false;
		TarsSkipToTag(skipFlag, tag, headType, headTag);
		if (tars_likely(skipFlag))
		{
			switch(headType)
			{
				case TarsHeadeZeroTag:
					n = 0;
					break;
				case TarsHeadeFloat:
					TarsReadTypeBuf(*this, n, float);
					n = tars_ntohf(n);
					break;
				case TarsHeadeDouble:
					TarsReadTypeBuf(*this, n, double);
					n = tars_ntohd(n);
					break;
				default:
				{
					char s[64];
					snprintf(s, sizeof(s), "read 'Double' type mismatch, tag: %d, get type: %d.", tag, headType);
					throw TarsDecodeMismatch(s);
				}
			}
		}
		else if (tars_unlikely(isRequire))
		{
			char s[64];
			snprintf(s, sizeof(s), "require field not exist, tag: %d, headTag: %d", tag, headTag);
			throw TarsDecodeRequireNotExist(s);
		}
	}

	/*void read(std::string& s, uint8_t tag, bool isRequire = true)
	{
		uint8_t headType = 0, headTag = 0;
		bool skipFlag = false;
		TarsSkipToTag(skipFlag, tag, headType, headTag);
		if (tars_likely(skipFlag))
		{
			switch(headType)
			{
			case TarsHeadeString1:
				{
					size_t len = 0;
					TarsReadTypeBuf(*this, len, uint8_t);
					char ss[256];
					//s.resize(len);
					//this->readBuf((void *)s.c_str(), len);
					TarsReadStringBuf(*this, s, len);
					//TarsReadBuf(*this, s, len);
					//s.assign(ss, ss + len);
				}
				break;
			case TarsHeadeString4:
				{
					uint32_t len = 0;
					TarsReadTypeBuf(*this, len, uint32_t);
					len = ntohl(len);
					if (tars_unlikely(len > TARS_MAX_STRING_LENGTH))
					{
						char s[128];
						snprintf(s, sizeof(s), "invalid string size, tag: %d, size: %d", tag, len);
						throw TarsDecodeInvalidValue(s);
					}
					//char *ss = new char[len];
					//s.resize(len);
					//this->readBuf((void *)s.c_str(), len);

					char *ss = new char[len];
					try
					{
						TarsReadBuf(*this, ss, len);
						s.assign(ss, ss + len);
					}
					catch (...)
					{
						delete[] ss;
						throw;
					}
					delete[] ss;
					TarsReadStringBuf(*this, s, len);
				}
				break;
			default:
			{
					   char s[64];
					   snprintf(s, sizeof(s), "read 'string' type mismatch, tag: %d, get type: %d.", tag, headType);
					   throw TarsDecodeMismatch(s);
			}
			}
		}
		else if (tars_unlikely(isRequire))
		{
			char s[64];
			snprintf(s, sizeof(s), "require field not exist, tag: %d", tag);
			throw TarsDecodeRequireNotExist(s);
		}
	}*/

	void read(std::string& s, uint8_t tag, bool isRequire = true)
	{
		uint8_t headType = 0, headTag = 0;
		bool skipFlag = false;
		TarsSkipToTag(skipFlag, tag, headType, headTag);
		if (tars_likely(skipFlag))
		{
			uint32_t strLength = 0;
			switch (headType)
			{
				case TarsHeadeString1:
				{
					TarsReadTypeBuf(*this, strLength, uint8_t);
				}
					break;
				case TarsHeadeString4:
				{
					TarsReadTypeBuf(*this, strLength, uint32_t);
					strLength = ntohl(strLength);
					if (tars_unlikely(strLength > TARS_MAX_STRING_LENGTH))
					{
						char s[128];
						snprintf(s, sizeof(s), "invalid string size, tag: %d, size: %d", tag, strLength);
						throw TarsDecodeInvalidValue(s);
					}
				}
					break;
				default:
				{
					char s[64];
					snprintf(s, sizeof(s), "read 'string' type mismatch, tag: %d, get type: %d, tag: %d.", tag, headType, headTag);
					throw TarsDecodeMismatch(s);
				}
			}
			TarsReadStringBuf(*this, s, strLength);
		}
		else if (tars_unlikely(isRequire))
		{
			char s[64];
			snprintf(s, sizeof(s), "require field not exist, tag: %d", tag);
			throw TarsDecodeRequireNotExist(s);
		}
	}

	void read(char *buf, const UInt32 bufLen, UInt32 & readLen, uint8_t tag, bool isRequire = true)
	{
		uint8_t headType = 0, headTag = 0;
		bool skipFlag = false;
		TarsSkipToTag(skipFlag, tag, headType, headTag);
		if (tars_likely(skipFlag))
		{
			switch(headType)
			{
				case TarsHeadeSimpleList:
				{
					uint8_t hheadType, hheadTag;
					readFromHead(*this, hheadType, hheadTag);
					if (tars_unlikely(hheadType != TarsHeadeChar))
					{
						char s[128];
						snprintf(s, sizeof(s), "type mismatch, tag: %d, type: %d, %d, %d", tag, headType, hheadType, hheadTag);
						throw TarsDecodeMismatch(s);
					}
					UInt32 size = 0;
					read(size, 0);
					if (tars_unlikely(size > bufLen))
					{
						char s[128];
						snprintf(s, sizeof(s), "invalid size, tag: %d, type: %d, %d, size: %d", tag, headType, hheadType, size);
						throw TarsDecodeInvalidValue(s);
					}
					//TarsReadTypeBuf(*this, size, UInt32);
					this->readBuf(buf, size);
					readLen = size;
				}
					break;

				default:
				{
					char s[128];
					snprintf(s, sizeof(s), "type mismatch, tag: %d, type: %d", tag, headType);
					throw TarsDecodeMismatch(s);
				}
			}
		}
		else if (tars_unlikely(isRequire))
		{
			char s[128];
			snprintf(s, sizeof(s), "require field not exist, tag: %d, headTag: %d", tag, headTag);
			throw TarsDecodeRequireNotExist(s);
		}
	}


	template<typename K, typename V, typename Cmp, typename Alloc>
	void read(std::map<K, V, Cmp, Alloc>& m, uint8_t tag, bool isRequire = true)
	{
		uint8_t headType = 0, headTag = 0;
		bool skipFlag = false;
		TarsSkipToTag(skipFlag, tag, headType, headTag);
		if (tars_likely(skipFlag))
		{
			switch(headType)
			{
				case TarsHeadeMap:
				{
					UInt32 size = 0;
					read(size, 0);
					if (tars_unlikely(size > this->size()))
					{
						char s[128];
						snprintf(s, sizeof(s), "invalid map, tag: %d, size: %d", tag, size);
						throw TarsDecodeInvalidValue(s);
					}
					m.clear();

					for (UInt32 i = 0; i < size; ++i)
					{
						std::pair<K, V> pr;
						read(pr.first, 0);
						read(pr.second, 1);
						m.insert(pr);
					}
				}
					break;
				default:
				{
					char s[64];
					snprintf(s, sizeof(s), "read 'map' type mismatch, tag: %d, get type: %d.", tag, headType);
					throw TarsDecodeMismatch(s);
				}
			}
		}
		else if (tars_unlikely(isRequire))
		{
			char s[64];
			snprintf(s, sizeof(s), "require field not exist, tag: %d, headTag: %d", tag, headTag);
			throw TarsDecodeRequireNotExist(s);
		}
	}

	template<typename Alloc>
	void read(std::vector<Char, Alloc>& v, uint8_t tag, bool isRequire = true)
	{
		uint8_t headType = 0, headTag = 0;
		bool skipFlag = false;
		TarsSkipToTag(skipFlag, tag, headType, headTag);
		if (tars_likely(skipFlag))
		{
			switch(headType)
			{
				case TarsHeadeSimpleList:
				{
					uint8_t hheadType, hheadTag;
					readFromHead(*this, hheadType, hheadTag);
					if (tars_unlikely(hheadType != TarsHeadeChar))
					{
						char s[128];
						snprintf(s, sizeof(s), "type mismatch, tag: %d, type: %d, %d, %d", tag, headType, hheadType, hheadTag);
						throw TarsDecodeMismatch(s);
					}
					UInt32 size = 0;
					read(size, 0);
					if (tars_unlikely(size > this->size()))
					{
						char s[128];
						snprintf(s, sizeof(s), "invalid size, tag: %d, type: %d, %d, size: %d", tag, headType, hheadType, size);
						throw TarsDecodeInvalidValue(s);
					}

					this->readBuf(v, size);
				}
					break;
				case TarsHeadeList:
				{
					UInt32 size = 0;
					read(size, 0);
					if (tars_unlikely(size > this->size()))
					{
						char s[128];
						snprintf(s, sizeof(s), "invalid size, tag: %d, type: %d, size: %d", tag, headType, size);
						throw TarsDecodeInvalidValue(s);
					}
					v.reserve(size);
					v.resize(size);
					for (UInt32 i = 0; i < size; ++i)
						read(v[i], 0);
				}
					break;
				default:
				{
					char s[128];
					snprintf(s, sizeof(s), "type mismatch, tag: %d, type: %d", tag, headType);
					throw TarsDecodeMismatch(s);
				}
			}
		}
		else if (tars_unlikely(isRequire))
		{
			char s[128];
			snprintf(s, sizeof(s), "require field not exist, tag: %d, headTag: %d", tag, headTag);
			throw TarsDecodeRequireNotExist(s);
		}
	}

	template<typename T, typename Alloc>
	void read(std::vector<T, Alloc>& v, uint8_t tag, bool isRequire = true)
	{
		uint8_t headType = 0, headTag = 0;
		bool skipFlag = false;
		TarsSkipToTag(skipFlag, tag, headType, headTag);
		if (tars_likely(skipFlag))
		{
			switch(headType)
			{
				case TarsHeadeList:
				{
					UInt32 size = 0;
					read(size, 0);
					if (tars_unlikely(size > this->size()))
					{
						char s[128];
						snprintf(s, sizeof(s), "invalid size, tag: %d, type: %d, size: %d", tag, headType, size);
						throw TarsDecodeInvalidValue(s);
					}
					v.reserve(size);
					v.resize(size);
					for (UInt32 i = 0; i < size; ++i)
						read(v[i], 0);
				}
					break;
				default:
				{
					char s[64];
					snprintf(s, sizeof(s), "read 'vector' type mismatch, tag: %d, get type: %d.", tag, headType);
					throw TarsDecodeMismatch(s);
				}
			}
		}
		else if (tars_unlikely(isRequire))
		{
			char s[64];
			snprintf(s, sizeof(s), "require field not exist, tag: %d, headTag: %d", tag, headTag);
			throw TarsDecodeRequireNotExist(s);
		}
	}

	/// 读取结构数组
	template<typename T>
	void read(T* v, const UInt32 len, UInt32 & readLen, uint8_t tag, bool isRequire = true)
	{
		uint8_t headType = 0, headTag = 0;
		bool skipFlag = false;
		TarsSkipToTag(skipFlag, tag, headType, headTag);
		if (tars_likely(skipFlag))
		{
			switch(headType)
			{
				case TarsHeadeList:
				{
					UInt32 size = 0;
					read(size, 0);
					if (tars_unlikely(size > this->size()))
					{
						char s[128];
						snprintf(s, sizeof(s), "invalid size, tag: %d, type: %d, size: %d", tag, headType, size);
						throw TarsDecodeInvalidValue(s);
					}
					for (UInt32 i = 0; i < size; ++i)
						read(v[i], 0);
					readLen = size;
				}
					break;
				default:
				{
					char s[64];
					snprintf(s, sizeof(s), "read 'vector struct' type mismatch, tag: %d, get type: %d.", tag, headType);
					throw TarsDecodeMismatch(s);
				}
			}
		}
		else if (tars_unlikely(isRequire))
		{
			char s[64];
			snprintf(s, sizeof(s), "require field not exist, tag: %d, headTag: %d", tag, headTag);
			throw TarsDecodeRequireNotExist(s);
		}
	}

	template<typename T>
	void read(T& v, uint8_t tag, bool isRequire = true, typename detail::disable_if<detail::is_convertible<T*, TarsStructBase*>, void ***>::type dummy = 0)
	{
		Int32 n = 0;
		read(n, tag, isRequire);
		v = (T) n;
	}

	/// 读取结构
	template<typename T>
	void read(T& v, uint8_t tag, bool isRequire = true, typename detail::enable_if<detail::is_convertible<T*, TarsStructBase*>, void ***>::type dummy = 0)
	{
		uint8_t headType = 0, headTag = 0;
		bool skipFlag = false;
		TarsSkipToTag(skipFlag, tag, headType, headTag);
		if (tars_likely(skipFlag))
		{
			if (tars_unlikely(headType != TarsHeadeStructBegin))
			{
				char s[64];
				snprintf(s, sizeof(s), "read 'struct' type mismatch, tag: %d, get type: %d.", tag, headType);
				throw TarsDecodeMismatch(s);
			}
			v.readFrom(*this);
			skipToStructEnd();
		}
		else if (tars_unlikely(isRequire))
		{
			char s[64];
			snprintf(s, sizeof(s), "require field not exist, tag: %d, headTag: %d", tag, headTag);
			throw TarsDecodeRequireNotExist(s);
		}
	}
};

//////////////////////////////////////////////////////////////////
template<typename WriterT = BufferWriter>
class TarsOutputStream : public WriterT
{
public:
	void writeUnknown(const std::string& s)
	{
		this->writeBuf(s.data(), s.size());
	}
	void writeUnknownV2(const std::string& s)
	{
		DataHead::writeTo(*this, DataHead::eStructBegin, 0);
		this->writeBuf(s.data(), s.size());
		DataHead::writeTo(*this, DataHead::eStructEnd, 0);
	}
	void write(Bool b, uint8_t tag)
	{
		write((Char) b, tag);
	}

	void write(Char n, uint8_t tag)
	{
		/*
		DataHead h(DataHead::eChar, tag);
		if(n == 0){
			h.setType(DataHead::eZeroTag);
			h.writeTo(*this);
		}else{
			h.writeTo(*this);
			this->writeBuf(&n, sizeof(n));
		}
		*/
		if (tars_unlikely(n == 0))
		{
			TarsWriteToHead(*this, TarsHeadeZeroTag, tag);
		}
		else
		{
			TarsWriteToHead(*this, TarsHeadeChar, tag);
			TarsWriteCharTypeBuf(*this, n, (*this)._len);
		}
	}

	void write(UInt8 n, uint8_t tag)
	{
		write((Short) n, tag);
	}

	void write(Short n, uint8_t tag)
	{
		//if(n >= CHAR_MIN && n <= CHAR_MAX){
		if (n >= (-128) && n <= 127)
		{
			write((Char) n, tag);
		}
		else
		{
			/*
			DataHead h(DataHead::eShort, tag);
			h.writeTo(*this);
			n = htons(n);
			this->writeBuf(&n, sizeof(n));
			*/
			TarsWriteToHead(*this, TarsHeadeShort, tag);
			n = htons(n);
			TarsWriteShortTypeBuf(*this, n, (*this)._len);
		}
	}

	void write(UInt16 n, uint8_t tag)
	{
		write((Int32) n, tag);
	}

	void write(Int32 n, uint8_t tag)
	{
		//if(n >= SHRT_MIN && n <= SHRT_MAX){
		if (n >= (-32768) && n <= 32767)
		{
			write((Short) n, tag);
		}
		else
		{
			//DataHead h(DataHead::eInt32, tag);
			//h.writeTo(*this);
			TarsWriteToHead(*this, TarsHeadeInt32, tag);
			n = htonl(n);
			TarsWriteInt32TypeBuf(*this, n, (*this)._len);
		}
	}

	void write(UInt32 n, uint8_t tag)
	{
		write((Int64) n, tag);
	}

	void write(Int64 n, uint8_t tag)
	{
		//if(n >= INT_MIN && n <= INT_MAX){
		if (n >= (-2147483647-1) && n <= 2147483647)
		{
			write((Int32) n, tag);
		}
		else
		{
			//DataHead h(DataHead::eInt64, tag);
			//h.writeTo(*this);
			TarsWriteToHead(*this, TarsHeadeInt64, tag);
			n = tars_htonll(n);
			TarsWriteInt64TypeBuf(*this, n, (*this)._len);
		}
	}

	void write(Float n, uint8_t tag)
	{
		//DataHead h(DataHead::eFloat, tag);
		//h.writeTo(*this);
		TarsWriteToHead(*this, TarsHeadeFloat, tag);
		n = tars_htonf(n);
		TarsWriteFloatTypeBuf(*this, n, (*this)._len);
	}

	void write(Double n, uint8_t tag)
	{
		//DataHead h(DataHead::eDouble, tag);
		//h.writeTo(*this);
		TarsWriteToHead(*this, TarsHeadeDouble, tag);
		n = tars_htond(n);
		TarsWriteDoubleTypeBuf(*this, n, (*this)._len);
	}

	void write(const std::string& s, uint8_t tag)
	{
		if (tars_unlikely(s.size() > 255))
		{
			if (tars_unlikely(s.size() > TARS_MAX_STRING_LENGTH))
			{
				char ss[128];
				snprintf(ss, sizeof(ss), "invalid string size, tag: %d, size: %u", tag, (uint32_t)s.size());
				throw TarsDecodeInvalidValue(ss);
			}
			TarsWriteToHead(*this, TarsHeadeString4, tag);
			uint32_t n = htonl((uint32_t)s.size());
			TarsWriteUInt32TTypeBuf(*this, n, (*this)._len);
			//this->writeBuf(s.data(), s.size());
			TarsWriteTypeBuf(*this, s.data(), s.size());
		}
		else
		{
			TarsWriteToHead(*this, TarsHeadeString1, tag);
			uint8_t n = (uint8_t)s.size();
			TarsWriteUInt8TTypeBuf(*this, n, (*this)._len);
			//this->writeBuf(s.data(), s.size());
			TarsWriteTypeBuf(*this, s.data(), s.size());
		}
	}

	void write(const char *buf, const UInt32 len, uint8_t tag)
	{
		TarsWriteToHead(*this, TarsHeadeSimpleList, tag);
		TarsWriteToHead(*this, TarsHeadeChar, 0);
		write(len, 0);
		//this->writeBuf(buf, len);
		TarsWriteTypeBuf(*this, buf, len);
	}

	template<typename K, typename V, typename Cmp, typename Alloc>
	void write(const std::map<K, V, Cmp, Alloc>& m, uint8_t tag)
	{
		//DataHead h(DataHead::eMap, tag);
		//h.writeTo(*this);
		TarsWriteToHead(*this, TarsHeadeMap, tag);
		Int32 n = (Int32)m.size();
		write(n, 0);
		typedef typename std::map<K, V, Cmp, Alloc>::const_iterator IT;
		for (IT i = m.begin(); i != m.end(); ++i)
		{
			write(i->first, 0);
			write(i->second, 1);
		}
	}

	template<typename T, typename Alloc>
	void write(const std::vector<T, Alloc>& v, uint8_t tag)
	{
		//DataHead h(DataHead::eList, tag);
		//h.writeTo(*this);
		TarsWriteToHead(*this, TarsHeadeList, tag);
		Int32 n = (Int32)v.size();
		write(n, 0);
		typedef typename std::vector<T, Alloc>::const_iterator IT;
		for (IT i = v.begin(); i != v.end(); ++i)
			write(*i, 0);
	}

	template<typename T>
	void write(const T *v, const UInt32 len, uint8_t tag)
	{
		TarsWriteToHead(*this, TarsHeadeList, tag);
		write(len, 0);
		for (Int32 i = 0; i < (Int32)len; ++i)
		{
			write(v[i], 0);
		}
	}

	template<typename Alloc>
	void write(const std::vector<Char, Alloc>& v, uint8_t tag)
	{
		//DataHead h(DataHead::eSimpleList, tag);
		//h.writeTo(*this);
		//DataHead hh(DataHead::eChar, 0);
		//hh.writeTo(*this);
		TarsWriteToHead(*this, TarsHeadeSimpleList, tag);
		TarsWriteToHead(*this, TarsHeadeChar, 0);
		Int32 n = (Int32)v.size();
		write(n, 0);
		//writeBuf(&v[0], v.size());
		TarsWriteTypeBuf(*this, v.data(), v.size());
	}

	template<typename T>
	void write(const T& v, uint8_t tag, typename detail::disable_if<detail::is_convertible<T*, TarsStructBase*>, void ***>::type dummy = 0)
	{
		write((Int32) v, tag);
	}

	template<typename T>
	void write(const T& v, uint8_t tag, typename detail::enable_if<detail::is_convertible<T*, TarsStructBase*>, void ***>::type dummy = 0)
	{
		//DataHead h(DataHead::eStructBegin, tag);
		//h.writeTo(*this);
		TarsWriteToHead(*this, TarsHeadeStructBegin, tag);
		v.writeTo(*this);
		TarsWriteToHead(*this, TarsHeadeStructEnd, 0);
		/*
		h.setType(DataHead::eStructEnd);
		h.setTag(0);
		h.writeTo(*this);
		*/
	}
};
////////////////////////////////////////////////////////////////////////////////////////////////////
}

//支持iphone
#ifdef __APPLE__
#include "TarsDisplayer.h"
#else
#include "tup/TarsDisplayer.h"
#endif

#endif